1. Frequency of episode exposure (similar to week-to-week retention ), and
2. Average length of episode exposure (similar to in-program retention ).

This technique of quantifying program loyalty was developed by Nielsen Media Research, Inc. Nielsen defines the four groups as follows:

• Gold Cards Those households/persons who, when viewing any part of the program, viewed 46% or more of the program minutes, and also viewed at least 55% of the programs.
• Silver Sliders Those households/persons who, when viewing any part of the program, viewed less than 46% of the program minutes, and also viewed at least 55% of the programs.
• Occasionally Committed Those households/persons who, when viewing any part of the program, viewed 46% or more of the program minutes, and also viewed less than 55% of the programs.
• Viewers Lite Those households/persons who, when viewing any part of the program, viewed less than 46% of the minutes, and also viewed less than 55% of the programs.
• Non-viewers selected as all unified households/persons with no viewing in total to any telecasts of the programs.

In each case, the tabulations are done for unified households/persons, and for in-tab days only.

Quad Analysis - Adults 18-49

The Audience Analysis System supports quad analysis in two ways:

• Previously Computed Quad Values Computed by a data provider, such as Nielsen Media Research, using minute-by-minute data and delivered to clients for selected demographic groups. The Audience Analysis System provides a convenient environment for selecting, displaying, charting, and printing this data. This requires prior licensing of the quad analysis data from the data provider.
• Computed Values Computed by the Audience Analysis System using mid-minute data. Includes flexibility in selecting any demographic or exposure group. Can also be displayed, charted, and printed.

The system requires a few seconds of interaction by the user to select a quad analysis to perform, and about one second to generate the chart.